<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert :closable="false" title="注意:只允许为第三级分类设置相关参数" type="warning" show-icon>
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row :gutter="10" class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <el-cascader v-model="selectCateKeys" :options="catelist" :props="cateProps" @change="handleChange" clearable>
          </el-cascader>
          <!-- 选择商品分类的级联选择框 -->

        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable :key="i" v-for="(item,i) in scope.row.attr_vals" @close="handleClose(i,scope.row)">
                  {{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable :key="i" v-for="(item,i) in scope.row.attr_vals" @close="handleClose(i,scope.row)">
                  {{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" @close="addDialogClosed" width="50%">
      <el-form :rules="addFormRules" ref="addFormRef" :model="addForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" @close="editDialogClosed" width="50%">
      <el-form :rules="editFormRules" ref="addFormRef" :model="editForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        chidrend: 'children'
      },
      // 级联选择器绑定的数组
      selectCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: {
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$Message.error('获取商品分类失败')

      this.catelist = res.data;
      // console.log(this.catelist);


    },
    // 级联选择框 选择项变化会触发
    handleChange() {
      this.getParamsData()
    },
    // Tab页签点击事件的处理函数
    handleTabClick() {
      //   console.log(this.activeName);
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明选中的是三级分类
      //   console.log(this.selectCateKeys);
      // 根据所选的id 和 当前所处的面板 获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$$Message.error('获取参数列表失败')

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 添加一个布尔值控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      //   console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }

    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮 添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$Message.error('添加参数失败')

        this.$Message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()

      })
    },
    // 点击按钮 展示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) return this.$Message.error('获取参数信息失败!')

      this.editForm = res.data
      this.editDialogVisible = true

    },
    // 关闭修改对话框后触发
    editDialogClosed() {
      // 重置修改的表单
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮 修改参数信息
    editParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$Message.error('修改参数失败!')

        this.$Message.success('修改参数成功!')
        this.getParamsData()
        this.editDialogVisible = false

      })
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$Message.info('已取消删除')
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) return this.$Message.error('删除参数失败!')

      this.$Message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点 或者按下回车键 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 用户输入了真实的内容 则需要做后续处理
      this.saveAttrVals(row)

    },
    // 将对attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // (这里只是同步渲染到了前端页面上 并没有进入数据库)
      if (row.inputValue !== '') {
        row.attr_vals.push(row.inputValue.trim())
      }
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求 保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if (res.meta.status !== 200) return this.$Message.error('修改参数项失败!')

      this.$Message.success('修改参数项成功!')
      console.log(res.data);
    },

    // 点击了new Tag 按钮 展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // $nextTick方法的作用 就是当页面上元素被重新渲染之后,才会执行回调函数中的代码
      this.$nextTick(_ => {
        // 让文本框自动获得焦点
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // tag标签关闭触发的函数 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      console.log(row.attr_vals);
      this.saveAttrVals(row)
    }

  },
  //   计算属性
  computed: {
    // 如果按钮需要被禁用 则返回true 否则返回false
    isBtnDisabled() {
      if (this.selectCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-cascader {
  width: 40%;
}

.el-tag {
  margin: 5px;
}

.input-new-tag {
  width: 150px;
}
</style>